Your team's brand guidelines change roughly once a quarter, and you reference them in most conversations about copy. Where should they live?

The principle — material that many conversations depend on belongs somewhere structural, and material that changes needs a single place to change it.

Why the key is correct — Anthropic describes uploading relevant documents to a project's knowledge base, held by a workspace with its own chat history. That gives both properties at once: every conversation inside the project can draw on the guidelines, and a quarterly update means replacing one file rather than remembering to paste the new version everywhere.

Why the others are wrong — pasting into every chat is the labour the knowledge base removes, and it makes the stale-copy problem worse rather than better. Claude does not know your organisation's particular rules. And memory carries context between conversations rather than serving as a document store you can quote from precisely.

Remember this — one authoritative copy in the workspace beats a paste in every conversation.

Sources — Anthropic's projects documentation.